Data class carrying stuff like variables and so on; new: tests
adding Processor imlementations with tests
improvements and new InvocationProcessor with test and Renderer as implementation of Processor, too
improvements and new TemplateProcessor with test
adding IfProcessor and test
improvements additions and new Whileprocessor with test
deleting OutputBuilder, adding ForProcessor with test and commenting classes
deleting StringReplacer (it was not used), adding ToStringProcessor, cleaning up